Portland Paintball is the closest PB field, but it would have to be pretty nasty weather for me to want to play indoors.
I took a group of 13 mostly inexpericeced players. I had to reserve the field in advance. The woman organizing the play was great, the refs were good and very flexible if we wanted to play different games. Restrooms are a little bit of a walk away. The field was fun, lots of natural obsitcles mixed with some man-made. It was $30.00 per person if you wanted to use thier masks and markers with 100 rounds. It was $20.00 if you had you own gear. A case of 2000 balls was $60.00. No outside paint. I plan on going back with a similar group.